Nontrivial Symmetries in k-essence Cosmology
Abstract
In the context of a spatially flat FLRW background, we perform a symmetry classification of k-essence models with Lagrangian densities of the form f1(ϕ)R+f2(ϕ,X). The kinetic term X is introduced as an independent degree of freedom via a Lagrange multiplier, and the lapse function is treated as a dynamical variable. The symmetry analysis is applied to the constrained system prior to any gauge fixing. This approach reveals symmetries which otherwise are lost when the lapse is fixed at the level of the action. The derived families of k-essence models admitting nontrivial symmetries fall to two general classes: minimally coupled and nonminimally coupled theories to gravity. We use the corresponding Noetherian conservation laws to derive exact cosmological solutions. We find that, when the numerical value of the conserved charges is zero, the field equations reduce to an algebraic relation. We subsequently derive power-law expressions for the scale factor with exponents determined by the particular k-essence function.
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BibTeX
@misc{lueizacolipi2026nontrivial,
title = {{Nontrivial Symmetries in $k$-essence Cosmology}},
author = {Andrés Lueiza-Colipí and Nikolaos Dimakis and Andronikos Paliathanasis},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.39729},
eprint = {2609.39729},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.39729},
}
RIS
TY - UNPB
TI - Nontrivial Symmetries in k-essence Cosmology
AU - Andrés Lueiza-Colipí
AU - Nikolaos Dimakis
AU - Andronikos Paliathanasis
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.39729
UR - https://arxiv.org/abs/2609.39729
AB - In the context of a spatially flat FLRW background, we perform a symmetry classification of k-essence models with Lagrangian densities of the form f_1(ϕ)R+f_2(ϕ,X). The kinetic term X is introduced as an independent degree of freedom via a Lagrange multiplier, and the lapse function is treated as a dynamical variable. The symmetry analysis is applied to the constrained system prior to any gauge fixing. This approach reveals symmetries which otherwise are lost when the lapse is fixed at the level of the action. The derived families of k-essence models admitting nontrivial symmetries fall to two general classes: minimally coupled and nonminimally coupled theories to gravity. We use the corresponding Noetherian conservation laws to derive exact cosmological solutions. We find that, when the numerical value of the conserved charges is zero, the field equations reduce to an algebraic relation. We subsequently derive power-law expressions for the scale factor with exponents determined by the particular k-essence function.
ER -